设计模式 - Singleton Pattern(单例模式)

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from:设计模式 - Singleton Pattern(单例模式)

作者：webabcd介绍保证一个类仅有一个实例，并提供一个访问它的全局访问点。示例保证一个类仅有一个实例。Singleton

using System;

using System.Collections.Generic;

using System.Text;

namespace Pattern.Singleton

{

/// <summary>

/// 泛型实现单例模式

/// </summary>

/// <typeparam name="T">需要实现单例的类</typeparam>

public class Singleton<T> where T : new()

{

/// <summary>

/// 返回类的实例

/// </summary>

public static T Instance

{

get { return SingletonCreator.instance; }

}

class SingletonCreator

{

internal static readonly T instance = new T();

}

Test

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using Pattern.Singleton;

public partial class Singleton : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

// 使用单例模式，保证一个类仅有一个实例

Response.Write(Singleton<Test>.Instance.Time);

Response.Write("<br />");

Response.Write(Singleton<Test>.Instance.Time);

Response.Write("<br />");

// 不用单例模式

Test t = new Test();

Response.Write(t.Time);

Response.Write("<br />");

Test t2 = new Test();

Response.Write(t2.Time);

Response.Write("<br />");

}

public class Test

{

private DateTime _time;

public Test()

{

System.Threading.Thread.Sleep(3000);

_time = DateTime.Now;

}

public string Time

{

get { return _time.ToString(); }

}

运行结果2007-2-10 22:35:112007-2-10 22:35:112007-2-10 22:35:142007-2-10 22:35:17OK

OK[源码下载]